Abstract
This paper deals with a parallel grinding method for ultra-precise aspherical parts such as aspherical lenses, molding dies and mirrors. The parallel grinding method is an arc-envelope grinding method in which a grinding wheel with an arc-shaped cross-section is used to generate an aspherical profile. The aspherical objective lens of the endscope was ground, and form accuracy and roughness of the ground surface utilized the parallel and conventional grinding methods are compared and investigated. Furthermore, the lenses processed by the usual molding and finished by the parallel grinding method were installed in the endscope, and resolving power was compared.
